Dell X51v

First thing you'll notice about this excellent PDA is the brilliant screen. The resolution is 640x480 and it looks spectacular. Movies and games look absolutely great and text is very easy to read. The system itself is very fast, (other than boot up after a soft reset, which takes 10-20 seconds) and the Windows Mobile 5.0 is a welcome addition. No longer do you have to worry about losing your data because the battery died.
It has both a Compact Flash and SD slot for expanded memory. Dell includes a host of software on the system as well as more on the included discs. Everything you need from word processing to powerpoint, even 3D games is included, (not all software is free, some is trial). And speaking of 3D capabilities, the X51v is no slouch. The 624 MHz version plays anything you throw at it. Quake Mobile runs perfectly on this machine and looks fantastic doing it. The overall 3D capabilities are just outstanding.
The design and feel are great and the buttons on the side are well placed. There is a voice record button as well as as a wireless access button. The directional pad on the unit could be a tad more intuitive, but the only need for that is games. The unit is solidly built and feels that way.
Overall I think the X51v is a very capable machine and quite possibly the best PDA on the market.